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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use math;
// Adds a [[duration]] to an [[instant]], returning an instant further in the
// future (given a positive duration), or further in the past (given a negative
// duration).
export fn add(i: instant, x: duration) instant = {
if (x == 0) {
return i;
} else if (x > 0) {
return instant {
sec = i.sec + (i.nsec + x) / SECOND,
nsec = (i.nsec + x) % SECOND,
};
} else {
return instant {
sec = i.sec + (i.nsec + x - SECOND + NANOSECOND) / SECOND,
nsec = (i.nsec + (x % SECOND) + SECOND) % SECOND,
};
};
};
// Returns the [[duration]] from [[instant]] "a" to [[instant]] "b".
export fn diff(a: instant, b: instant) duration = {
return ((b.sec - a.sec) * SECOND) + (b.nsec - a.nsec);
};
// Returns -1 if a precedes b, 0 if a and b are simultaneous, or +1 if b
// precedes a.
export fn compare(a: instant, b: instant) i8 = {
return if (a.sec < b.sec) -1
else if (a.sec > b.sec) 1
else if (a.nsec < b.nsec) -1
else if (a.nsec > b.nsec) 1
else 0;
};
// Scales the given [[instant]]'s scalar value by a factor 'f'. Make sure to
// know what epoch you're dealing with.
export fn mult(i: instant, f: f64) instant = {
// use positive numbers for convenience
const positive = if (i.sec < 0 ^^ f < 0.0) false else true;
const f = if (f < 0.0) -f else f;
const asec: i64 = if (i.sec < 0) -i.sec - 1 else i.sec;
const ansec: i64 = if (i.sec < 0) SECOND - i.nsec else i.nsec;
// initial multiply
const fsec = (asec: f64 * f);
const bsec = fsec: i64;
const fnsec = (ansec: f64 * f);
const bnsec = fnsec: i64;
// get seconds overflow (nsec remainder)
const secrem = math::modf64(fsec, 1.0);
const addnsec = (secrem * SECOND: f64): i64;
// add overflows
const b = instant {
sec = bsec,
nsec = ansec,
};
const b = add(b, bnsec - ansec); // add nsec overflow
const b = add(b, addnsec); // add sec overflow
// switch back to original sign
const b = if (positive) {
yield b;
} else {
yield instant {
sec = -b.sec - 1,
nsec = SECOND - b.nsec,
};
};
return b;
};
@test fn add() void = {
const cases = [
// instant a duration x instant b
( 0, 0, -2000000001, -3, 999999999),
( 0, 0, -2000000000, -2, 0),
( 0, 0, -1999999999, -2, 1),
( 0, 0, -1000000001, -2, 999999999),
( 0, 0, -1000000000, -1, 0),
( 0, 0, -999999999, -1, 1),
( 0, 0, -1, -1, 999999999),
( 0, 0, 0, 0, 0),
( 0, 0, 1, 0, 1),
( 0, 0, 999999999, 0, 999999999),
( 0, 0, 1000000000, 1, 0),
( 0, 0, 1000000001, 1, 1),
( 0, 0, 1999999999, 1, 999999999),
( 0, 0, 2000000000, 2, 0),
( 0, 0, 2000000001, 2, 1),
( 0, 1, -2000000001, -2, 0),
( 0, 1, -2000000000, -2, 1),
( 0, 1, -1999999999, -2, 2),
( 0, 1, -1000000001, -1, 0),
( 0, 1, -1000000000, -1, 1),
( 0, 1, -999999999, -1, 2),
( 0, 1, -1, 0, 0),
( 0, 1, 0, 0, 1),
( 0, 1, 1, 0, 2),
( 0, 1, 999999999, 1, 0),
( 0, 1, 1000000000, 1, 1),
( 0, 1, 1000000001, 1, 2),
( 0, 1, 1999999999, 2, 0),
( 0, 1, 2000000000, 2, 1),
( 0, 1, 2000000001, 2, 2),
(-1, 999999999, -2000000001, -3, 999999998),
(-1, 999999999, -2000000000, -3, 999999999),
(-1, 999999999, -1999999999, -2, 0),
(-1, 999999999, -1000000001, -2, 999999998),
(-1, 999999999, -1000000000, -2, 999999999),
(-1, 999999999, - 999999999, -1, 0),
(-1, 999999999, -1, -1, 999999998),
(-1, 999999999, 0, -1, 999999999),
(-1, 999999999, 1, 0, 0),
(-1, 999999999, 999999999, 0, 999999998),
(-1, 999999999, 1000000000, 0, 999999999),
(-1, 999999999, 1000000001, 1, 0),
(-1, 999999999, 1999999999, 1, 999999998),
(-1, 999999999, 2000000000, 1, 999999999),
(-1, 999999999, 2000000001, 2, 0),
( 0, 999999999, -2000000001, -2, 999999998),
( 0, 999999999, -2000000000, -2, 999999999),
( 0, 999999999, -1999999999, -1, 0),
( 0, 999999999, -1000000001, -1, 999999998),
( 0, 999999999, -1000000000, -1, 999999999),
( 0, 999999999, -999999999, 0, 0),
( 0, 999999999, -1, 0, 999999998),
( 0, 999999999, 0, 0, 999999999),
( 0, 999999999, 1, 1, 0),
( 0, 999999999, 999999999, 1, 999999998),
( 0, 999999999, 1000000000, 1, 999999999),
( 0, 999999999, 1000000001, 2, 0),
( 0, 999999999, 1999999999, 2, 999999998),
( 0, 999999999, 2000000000, 2, 999999999),
( 0, 999999999, 2000000001, 3, 0),
];
for (let i = 0z; i < len(cases); i += 1) {
const C = cases[i];
const a = instant { sec = C.0, nsec = C.1 };
const x = C.2;
const b = instant { sec = C.3, nsec = C.4 };
const B = add(a, x);
assert(B.sec == b.sec, "time::add() .sec error");
assert(B.nsec == b.nsec, "time::add() .nsec error");
};
};
@test fn compare() void = {
let a = now(clock::MONOTONIC);
sleep(1 * MILLISECOND);
let b = now(clock::MONOTONIC);
assert(compare(a, b) < 0);
assert(compare(b, a) > 0);
assert(compare(a, a) == 0);
};
@test fn mult() void = {
const cases = [
// instant a factor f instant b interpretations
( 0, 0, 0.000, 0, 0), // 0.000000000
( 9, 0, 0.000, 0, 0), // 0.000000000
( 0, 999999999, 0.000, 0, 0), // 0.000000000
( 9, 999999999, 0.000, 0, 0), // 0.000000000
( 1, 0, 1.000, 1, 0), // 1.000000000
( 9, 0, 1.000, 9, 0), // 9.000000000
( 1, 999999999, 1.000, 1, 999999999), // 1.999999999
( 9, 999999999, 1.000, 9, 999999999), // 9.999999999
( 1, 0, 0.001, 0, 1000000), // 0.001000000
( 1, 0, 0.010, 0, 10000000), // 0.010000000
( 1, 0, 0.100, 0, 100000000), // 0.100000000
(-1, 0, 0.001, -1, 999000000), // -0.001000000
(-1, 0, 0.010, -1, 990000000), // -0.010000000
(-1, 0, 0.100, -1, 900000000), // -0.100000000
(-1, 0, 1.000, -1, 0), // -1.000000000
( 0, 500000000, 0.001, 0, 500000), // 0.005000000
( 0, 500000000, 0.010, 0, 5000000), // 0.050000000
( 0, 500000000, 0.100, 0, 50000000), // 0.500000000
( 2, 0, 0.001, 0, 2000000), // 0.002000000
( 2, 0, 0.010, 0, 20000000), // 0.020000000
( 2, 0, 0.100, 0, 200000000), // 0.200000000
( 3, 141592653, 3.141, 9, 867742523), // 9.867742523073
( 2, 718281828, 2.718, 7, 388290007), // 7.388290008504 (rounds down?)
( 1, 414213562, 1.414, 1, 999697975), // 1.999697976668 (rounds down?)
( 3, 141592653, -3.141, -10, 132257477), // -9.867742523073
( 2, 718281828, -2.718, -8, 611709993), // -7.388290008504
( 1, 414213562, -1.414, -2, 302025), // -1.999697976668
(-4, 858407347, 3.141, -10, 132257477), // -9.867742523073
(-3, 281718172, 2.718, -8, 611709993), // -7.388290008504
(-2, 585786438, 1.414, -2, 302025), // -1.999697976668
(-4, 858407347, -3.141, 9, 867742523), // 9.867742523073
(-3, 281718172, -2.718, 7, 388290007), // 7.388290008504
(-2, 585786438, -1.414, 1, 999697975), // 1.999697976668
];
for (let i = 0z; i < len(cases); i += 1) {
const C = cases[i];
const a = instant { sec = C.0, nsec = C.1 };
const f = C.2;
const b = instant { sec = C.3, nsec = C.4 };
const B = mult(a, f);
assert(B.sec == b.sec, "time::mult() .sec error");
assert(B.nsec == b.nsec, "time::mult() .nsec error");
};
};
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